.ht {
    text-align: center;
    color: cadetblue;
    font-family: 幼圆, serif;
}

.tab {
    width: 500px;
    border: 5px solid cadetblue;
    margin: 0 auto;
    border-radius: 5px;
    font-family: 幼圆, serif;
}

.ltr td {
    border: 1px solid powderblue;

}

.ipt {
    border: 0;
    width: 50%;

}

.btn1 {
    border: 2px solid powderblue;
    border-radius: 4px;
    width: 60px;
    background-color: antiquewhite;

}

.msg {
    color: gold;
}

.buttonContainer {
    text-align: center;
}